Datasheet Linear Technology LTC3388

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  Easy, ±5V Split-Voltage Power Supply for Analog Circuits Draws Only 720nA at No Load &mdash LT Journal
  PDF, 835 Kb, File published: Jul 15, 2011
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  Easy, В±5V Split-Voltage Power Supply for Analog Circuits
  Draws Only 720nA at No Load
  Jim Drew Analog circuits often need a split-voltage power supply to achieve a virtual
  ground at the output of an amplifier. These split-voltage power supplies are
  generally low power supplies supporting tens of milliamps of differential current
  loads. Figure 1 shows such a power supply using two LTC3388-3 20V high
  efficiency step-down regulators powered from a 6V–12V power source.
  The positive voltage rail is created by
  configuring one LTC3388-3 in its standard
  buck topology while the negative voltage
  rail is created with a second LTC3388-3 by
  grounding the VOUT connection and using
  the GND pin as the negative voltage rail.
  The negative voltage rail is connected to
  the exposed pad of this LTC3388-3 and
  must be isolated from the system ground
  plane and have sufficient surface area to
  provide adequate cooling of the LTC3388-3. while maintaining output regulation. They
  are capable of supplying up to 50m A of
  load current and contain an accurate
  undervoltage lockout (UVLO) feature to
  maintain a low quiescent current when the
  input is below 2.3V. The output voltage …

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  Nanopower Buck Converter Runs on 720nA, Easily Fits into Energy Harvesting and Other Low Power Applications &mdash LT Journal
  PDF, 581 Kb, File published: Jan 18, 2011
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  design ideas Nanopower Buck Converter Runs on 720nA, Easily Fits into
  Energy Harvesting and Other Low Power Applications
  Michael Whitaker The LTC3388-1/LTC3388-3 integrated synchronous stepdown regulator provides a regulated output while consuming
  a mere 720nA of quiescent current. It accepts inputs up to
  20V and can deliver up to 50mA of load current. Eight pinselectable output voltages are offered: 1.2V, 1.5V, 1.8V, and
  2.5V on the LTC3388-1 and 2.8V, 3.0V, 3.3V, and 5.0V on the
  LTC3388-3. The extremely low quiescent current prolongs
  battery life for keep-alive circuits in portable electronics and
  makes it a good fit for energy harvesting applications. HIGH EFFICIENCY AT LIGHT LOADS The LTC3388-1/LTC3388-3 (Figure 1)
  achieves its low quiescent current by
  entering a sleep state once the output
  is in regulation. In the sleep state, load
  current is provided by the output capacitor while the output voltage is monitored. When the output falls below a
  fixed hysteresis window, the converter
  wakes up and refreshes the capacitor. SUPPORTS ENERGY HARVESTING
  APPLICATIONS current required to maintain regulation
  approaches the DC sleep quiescent current.
  ENABLE AND STANDBY This hysteretic method of providing a
  regulated output minimizes losses associated with FET switching and makes it
  possible to efficiently regulate at very
  light loads. The total quiescent current at
  VIN in the sleep state is 720n A when VIN is
  4V and increases to only 820n A when …

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Manufacturer's Classification

• Power Management > Energy Harvesting
• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Micropower Buck Regulators | Internal Power Switch Buck